Rotatable piston pump available for viscose



Nov. 19, 1929. L. JACOT-DESCOMBES I 1,735,497

ROTATAELE PISTON PUMP AVAILABLE FOR VISCOSE Filed Feb. 24. 1928 4 Sheets-Sheet 1 Nov. 19, 1929.

L. JACOT-DESCQMBES ROTATABLE PISTON PUMP AVAILABLE FOR. VISCOSE 4 Sheets-Sheet 2 Filed Feb. 24. 1928' Jain-a7- Berna m 4;

Nov. 19, 1929. L. JACOT-DESCOMBES 1,736,497

- ROTATABLE PISTON PUMP AVAILABLE FOR VISCOSE Filed Feb. 24. 1928 4 Sheets-Sheet 5 'Nov. 19, 1929. L. JACOT-DESCOMBES ROTATABuE PISTON PUMP AVAILABLE FOR VISCOSE 1928 4 Sheets-Sheet 4 Filed Feb. 24

Patented Nov. 19, 1929 UNITED STATES PATENT OFFICE BOTATABLE PISTON PUMP AVAILABLE I'OB VISCQSE Application filed February 24, 1928, Serial No. 256,749, and in Switzerland February 28, 1927.

The present invention relates to piston pumps available for viscose in the manufacture of artificial silk.

Rotatable piston pumps are alreadys known where the pump body is a rotor having two holes of the same diameter and pistons pressed by springs against a casing arranged eccentrically to the axis of the rotor. In this kind of pumps the liquid is drawn in and discharged into a chamber having the cross section of a segment. The pistons are pressed against the casing by means of springs which separate the same in a radial sense. In other pumps having pistons in the inside of a rotor these pistons are worked by eccentric disks inside of the pistons which is a costly arrangement requiring a complicated machining.

One object of the present invention is a piston pump having an adjustable output and being available especially for the manufacture of artificial silk and in which the body of the pump rotatively mounted is hollowed out and encloses a stationary eccentrically arranged pivot pin. The pistons are hinged to this pin so that their attaching points will oscillate around the stationary pivot axis and that the pistons will slide within the pump body while the latter is rotated.

Another object of the invention is means 8 for lubricating automatically and abundantly the inner parts of the pump body and the pump body itself whichheretofore has not been made to a sufiicient extent. According to the present invention it is also rendered possible to counterbalance the pressures inside of the pump and to reduce thereby the motive power required. To this end the admitted liquid pass es across a counterbalancing chamber where it.

is constantly replaced andby progressing it will touch the mentioned ever moving parts so that they will be thoroughly lubricated.

In the annexed drawings four working forms are represented as examples.

Figs. 1 and 2 are sectional views of a first form; i V

Fig. 1 a section on line I-I in Fig. 2,- and Fig. 2 a section on line 11-11 of Fig. 1. Figs. 3 and 4 are an end view and a cross section and relate to a modification of the adjusting device of the eccentricity between the axis of the pump body and that of the trunnion for the pistons.

Figs. 5, 6 and 7 relate toa third form.

Fig. 5 is a side view with the cover removed;

Fig. ,6 is a cross section on line VIVI of Fig. 5, and

Fig. 7 is a perspective view of the casing.

Figs. 8 to lOrelate to a fourth form;

, Fig. 8 is a side viewrof the pump having the cover removed; I

Fig. 9 is a cross section on line IX-IX of Fig. 8, and

Fig. 10 is a perspective view of the casing.

According to Figures 1 and 2 the orifices of the inlet and the discharge canals I) and 0 of the pump are provided on the two opposite side faces of a latteral protuberance of the cylindrical casing a on one side face cZ of'7o which is an oval hole forming a slide wherein is held fixed a trunnion f by means of a nut e. The relative position "of the trunnion f within the said slide is made adjustable in a radial sense by a screw 9 which is held stationary by means of a set screw arranged transversally to the same.

The cylindrical pump body it is provided with a number of radial holes 71 all in the same plane. It is rotatably lodged in the cover plate Z with an axis 0 forming a lengthening extended to the outside of the casing. In the hollow inside of the pump body 12. and fitted to the cylindrical surface of the eccentrically arranged trunnion f are provided slide shoes m hinged by means of pins n to pistons 0 fitted .into the said holes 2'. These slide shoes are held in position around the trunnion f by means of the hoops p located on both sides of the said pistons.

The working of the pump is as follows:

While the pump body it turns it moves the pistons 0. The slide shoes are guided by the pistons and are slidingly on the outside of the trunnion f. The eccentrical position of the trunnion with regard to the axis k, determines the stroke of the pistons. The liquid is admitted to thepistons through the canal I) and a circumferential groove 9 inside of the casing and between the two circumferential spaces 1' where the casing a fits close to the pump bod k and which separates the admission side rom the discharge side. A similar groove 8 on the discharge side communicates trunnion f and graduations are provided ona disk as which is rigidly fast to said trunnion and to said eccentric disk which graduations serve to determine the eccentricit to which the stroke of the pistons may e limited. possible fix the exact out- Thus it will be put of the pump.

According to Figures 5 to 7-. the'cylindrical casing a has a lateral-extension containing the orifices of admission and discharge canals b and 0. In the eye d on the side face of the casing is lodged-slidably in an oval hole the stationary trunnion f and maintained in I its respective position .by means of a nut e and an adjusting screw 9. Inside of the casing is the hollowpump body h provided with radial perforations 21 wherein are slidably held the pistons o by-ineans/bf slide shoes an arranged around said stationary trunnion f. These shoes are'fitted to the surface of the trunnion and held in position by means of hoops p on each side of the pistons.

Inside of the casing separated by. the two extents 1' where the pump body fits close to,

the casing are the grooves g and 8 into which discharge the radial pump cylinders of the body. The groove g is on the admission side where the pistons move towards the center and are filling. The groove 8 is on the discharge side and communicates with the dis charge canal a. The inlet canal 'Z; communicates througlr a transversal canal 1 in the casing with a circular groove o of t e pump body next to the cover of the casing. From cated within the radial c linders.

movements suck upthe liqui from the groove this groove '0 which is a 'counterbalancing chamber ports a in the pump body admit the liquid 'to the hollow inside 72. of the pump body and from there with the aid of a conical hollow k in said body into a circular groove 9 provided in the casing. This groove communicates with the groove g of the admission side throu h a transverse canal g Y The wor ing of the pump is as follows When the hollow pump body.turns under the influence of a power acting on the axis is the pistons owing to the eccentrical position of the stationary trunnion 7 ,will bere cli prm hese 9 into thecylinders a which after having passed the extent of contact between pump body and easing which. so aratesthe two grooves g and s will disc arge their content into the grooves 8. The sucking effect will be transmitted from the groove q through roove g and the inside of the pump body and the ports a to the counterbalancing chamber a. From here the sucking efiect will be transmitted through 'the canal q to the admission canal b. Thus the'liquid will be always renewed and circulated through the whole pump and will touch all the movable parts so as to assure a perfect and com lete ubricating. The full part of the pump ody making contact with the cover will also get lubricated. Besides the two face sides of the pump body are making-contact with a liquid of the same pressure and these parts will therefore be counterbalanced.

In the working form according to the Figures 8, 9 and 10 corresponding parts are designated with the. same letters of reference. The canal 1 and the groove 3 are provided on the inside of the casing.

ese con-- duits are directed inan inverse direction so that the circulating liquid takes another path; The sucking effect will be transmitted fromthe groove through the canal qinto the' hollow insi e of the pump body and from there through the cavity q to the admission canal b of the pump. The sucked-in liquid fills the hollow inside of the body It completely and lubricates all the movable parts there. Liquid will also-come through the ports a into the counterbalancing chamber '1: and will be renewed there owing to'the moving parts inside of the pump body. I

Here therefore the two getting total hquid supply, as was-the case in the preceding working form, are crossed on a certain part of their path by two separate branches of liquid. The lubrlcatingof all the parts will therefore be effected bya. liquid chambers instead of which is constantlyrenewed and which has 7 I not time enough to change and to lose its.

lubricating qualities as is generally the case with the viscose. Also in this working example the same pressure will ,existon both side faces of the pump body.

It is evident that where the liquid circulates through one of the chambers and then through the other the direction of the flow of the liquid crossed one after the other. by the through the pump could be inverse, of that in:

dicated in the preceding case that is the liquid from the admission canal could be directed into the chamber ofthe mechanism and'from I here into the admission groove.

Attention must be called to the. fact that I with the arrangement according-to the present invention a lateral adjustment of. the piston shoes is rendered possible, ahfact which is not present in known pumps of this kind.

This adjusting possibility of the shoes is the I necessary condition for the regular and exact working of s'uchpumps and ever needed because it is practically not ossibleto drill the radial holes in the pump body with such an exactness that the axes of all the cylinderscoincide with one and the same plane.

v What I claim as new is:

In a rotatable piston um available for rviscos e and having an ad usta 1e out-put," the combination, a cylindrical casing possessing a lateral extension and acover plate constituting its one side face, a stationary trunnion rojecting into the inside of said casing and held adj ustably in a radial-sense in theother side face of the casing, a cylindrical hollow pump body in contact with the inside of the casing only at two limited and diametrically opposed extents and having at least one set of radial perforations and an axis integral with it mounted rotatably in said cover,

7 pistons fitted slidably into-said perforations of the pnmp body and hinged to slide shoes capable of some lateral ad'ustment and fitted close to the surface of said trunnion, hoops adapted to mantain the contact between said shoes and the trunnion, two circumferential segmental grooves provided in the casing and separatedby said contact extents between the casing and the pump body, a circular groove between this body and the bottom face of the casing and a counterbalancing chamber on 80 the opposite side between the pump body and the cover plate, admission and discharge canals with orificesin said lateral extension ofthe casing and communicating canals be tween the admission canal and the counterbalancing chamber and between the discharge canal and the said circular groove and circumferential discharge groove, the whole with a view of lubricating all movable parts of the pump with a sonstantl renewed liquid.

40 In testimony whereof I a my signature.

LEON JAGOT-DE SCOMBES 

